package com.example.android.apis.animation;

import com.example.android.apis.R;

import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;
import android.widget.ArrayAdapter;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.view.View;
import android.view.ViewGroup;
import android.view.animation.Animation;
import android.view.animation.AccelerateInterpolator;
import android.view.animation.DecelerateInterpolator;

/**
 * This sample application shows how to use layout animation and various
 * transformations on views. The result is a 3D transition between a ListView
 * and an ImageView. When the user clicks the list, it flips to show the
 * picture. When the user clicks the picture, it flips to show the list. The
 * animation is made of two smaller animations: the first half rotates the list
 * by 90 degrees on the Y axis and the second half rotates the picture by 90
 * degrees on the Y axis. When the first half finishes, the list is made
 * invisible and the picture is set visible.
 */
public class Transition3d extends Activity implements
		AdapterView.OnItemClickListener, View.OnClickListener {
	private ListView mPhotosList;
	private ViewGroup mContainer;
	private ImageView mImageView;

	// Names of the photos we show in the list
	private static final String[] PHOTOS_NAMES = new String[] { "Lyon",
			"Livermore", "Tahoe Pier", "Lake Tahoe", "Grand Canyon", "Bodie" };

	// Resource identifiers for the photos we want to display
	private static final int[] PHOTOS_RESOURCES = new int[] {
			R.drawable.photo1, R.drawable.photo2, R.drawable.photo3,
			R.drawable.photo4, R.drawable.photo5, R.drawable.photo6 };

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		setContentView(R.layout.animations_main_screen);

		mPhotosList = (ListView) findViewById(android.R.id.list);
		mImageView = (ImageView) findViewById(R.id.picture);
		mContainer = (ViewGroup) findViewById(R.id.container);

		// Prepare the ListView
		final ArrayAdapter<String> adapter = new ArrayAdapter<String>(this,
				android.R.layout.simple_list_item_1, PHOTOS_NAMES);

		mPhotosList.setAdapter(adapter);
		mPhotosList.setOnItemClickListener(this);

		// Prepare the ImageView
		mImageView.setClickable(true);
		mImageView.setFocusable(true);
		mImageView.setOnClickListener(this);

		// Since we are caching large views, we want to keep their cache
		// between each animation
		mContainer
				.setPersistentDrawingCache(ViewGroup.PERSISTENT_ANIMATION_CACHE);
	}

	/**
	 * Setup a new 3D rotation on the container view.
	 * 
	 * @param position
	 *            the item that was clicked to show a picture, or -1 to show the
	 *            list
	 * @param start
	 *            the start angle at which the rotation must begin
	 * @param end
	 *            the end angle of the rotation
	 */
	private void applyRotation(int position, float start, float end) {
		// Find the center of the container
		final float centerX = mContainer.getWidth() / 2.0f;
		final float centerY = mContainer.getHeight() / 2.0f;

		// Create a new 3D rotation with the supplied parameter
		// The animation listener is used to trigger the next animation
		final Rotate3dAnimation rotation = new Rotate3dAnimation(start, end,
				centerX, centerY, 310.0f, true);
		rotation.setDuration(500);
		rotation.setFillAfter(true);
		rotation.setInterpolator(new AccelerateInterpolator());
		rotation.setAnimationListener(new DisplayNextView(position));

		mContainer.startAnimation(rotation);
	}

	public void onItemClick(AdapterView<?> parent, View v, int position, long id) {
		// Pre-load the image then start the animation
		mImageView.setImageResource(PHOTOS_RESOURCES[position]);
		applyRotation(position, 0, 90);
	}

	public void onClick(View v) {
		applyRotation(-1, 180, 90);
	}

	/**
	 * This class listens for the end of the first half of the animation. It
	 * then posts a new action that effectively swaps the views when the
	 * container is rotated 90 degrees and thus invisible.
	 */
	private final class DisplayNextView implements Animation.AnimationListener {
		private final int mPosition;

		private DisplayNextView(int position) {
			mPosition = position;
		}

		public void onAnimationStart(Animation animation) {
		}

		public void onAnimationEnd(Animation animation) {
			mContainer.post(new SwapViews(mPosition));
		}

		public void onAnimationRepeat(Animation animation) {
		}
	}

	/**
	 * This class is responsible for swapping the views and start the second
	 * half of the animation.
	 */
	private final class SwapViews implements Runnable {
		private final int mPosition;

		public SwapViews(int position) {
			mPosition = position;
		}

		public void run() {
			final float centerX = mContainer.getWidth() / 2.0f;
			final float centerY = mContainer.getHeight() / 2.0f;
			Rotate3dAnimation rotation;

			if (mPosition > -1) {
				mPhotosList.setVisibility(View.GONE);
				mImageView.setVisibility(View.VISIBLE);
				mImageView.requestFocus();

				rotation = new Rotate3dAnimation(90, 180, centerX, centerY,
						310.0f, false);
			} else {
				mImageView.setVisibility(View.GONE);
				mPhotosList.setVisibility(View.VISIBLE);
				mPhotosList.requestFocus();

				rotation = new Rotate3dAnimation(90, 0, centerX, centerY,
						310.0f, false);
			}

			rotation.setDuration(500);
			rotation.setFillAfter(true);
			rotation.setInterpolator(new DecelerateInterpolator());

			mContainer.startAnimation(rotation);
		}
	}

}
